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hardware
Metal or plastic fasteners, hinges, doorknobs (pulls); used on
cabinetry, doors and contents items.
hatch
A removable or hinged cover in a roof or floor system.
hazardous substance
A chemical or agent that is harmful or can cause injury by any
degree to humans or animals.
header
A structural member that crosses over an opening, used to support
trusses, joists, etc.
heat
The vibration of molecules, energy, can change the substance of a
chemical, also used to
structurally dry water damaged buildings.
heat line
A distinct line along a wall or ceiling representing areas effected
by heat.
heat quantity
Common unit of measure of the quantity of heat is the British
Thermal Unit (Btu).
heat
transfer
Heat
always flows toward a substance of lower temperature until the
temperatures of the two substances equalize, and travels by;
conduction, convection or radiation.
HEPA
High efficiency particulate arresting filter, capable of collecting
99.8% of air particles.
hidden
damages
Damages that are not readably noticeable, hidden behind a wall,
between floors, etc.; latent reaction or discovery.
highly
porous
Materials having a permeance factor of > 10, having an excellent
absorption and evaporation rate.
hot
water extraction
A carpet and upholstery cleaning process where soils are sprayed
with a cleaning agent and hot water and removed with a vacuum; truck
mount or portable.
humidifier
An electrical/mechanical device used to increase moisture in the
air.
humidity
Dampness, measurement of moisture in the air.
HVAC
Heating, ventilating and air conditioning, a mechanical system
consisting of a furnace, air conditioner and ductwork, HVAC system.
hydraulics
The operation of machinery through the force of a liquid.
hydrocarbon
A compound containing hydrogen and carbon atoms which are associated
with current and past life.
hydrofluoric acid
H6F6, H4F4, H2F2 or HF dependent on temperatures, the reaction of
sulfuric acid with solid fluorides, corrosive, used in etching
glass.
hydrogen
H, flammable colorless gas.
hydrogen chloride
HCl, gaseous matter, produced in fires from the decomposition of
PVC, will turn into hydrochloric acid of the same formula HCl when
mixed with moisture through a process called hydrolysis.
hydrogen ion
The positively charged ion in an acid.
hydrogen peroxide
H2O2, a bleaching agent, very unstable, antiseptic, produced when
moisture is mixed with ozone, O3.
hydrolysis
A chemical reaction, the decomposition of a chemical by taking
water, hydrogen chloride when mixed with water turns into
hydrochloric acid.
hydrostatic pressure
Water pressure, generally on or against the exterior of a basement
blockwall.
hydroxyl
The negative charged OH (oxygen + hydrogen) radicals in an organic
compound.
hygrometer
A meter or device that measures the humidity of the air.
hygroscopic
To absorb and retain water from the air.
hypochlorite
Chlorine bleach, salt of hypochlorous acid.
